Abrading machine



E. F. HODGKINS ABRADING MACHINE March 9 1926.

Filed Oct. l5, 1925 VPatented Mar. 9, 1926.

UNITED STATES l 1,575,686 `PATENT OFFICE.

EDWARD E. HOEGKINS, E BEVERLY, MASSACHUSETTS,

ASSIGNOR. BY MESNE .AS-

SIGNMENTS, TO UNITED SHOE MACHINERY CORPORATION, OF PATERSON, NEW JERSEY, A CORPORATION OF NEW JERSEY.

lABEAnINci MACHINE.

Application inea october 15, 192s. serial No. 668,661.

To @ZZ whom it may concern.'

Be it known that I, EDWARD F. HonGmNs, l a citizen of the United States, residing at Beverly, in the county of Essex and State of Massachusetts, have invented certain Improvements in Abrading Machines, of which the following description, in connection with the. accompanying drawings, is a specification, like reference characters on the drawings indicating like parts inthe several ligures.

This invention relates to abrading maehines and is illustrated as embodied in a cylindrical roll especially adapted to be use d for bufling or scourin the breasts of L'ouis heels and also forbu ng the scallop which is provided in some heels of this type.

The curvature of the breast of a Louis heel is such that it can be effectively bufled -by.the use of a cylindrical roll of relativelysmall diameter, an inch or less, for example. If such a roll is mounted so that one end is free for the presentation of the work, it may also be used for buliing the scallop.

in the lower end ofthe breast of the heel. Buling operations require a softness of touch which makes a pneumatic tool particularly desirable.

Accordingly, an object of the present 1n'- y vention is-to devise an im roved cylindrical pneumatic buiiing tool a apted to be supported on the end of a rotating mandrel.

In the illustrated construction, the tool 1s so designed that it may conveniently be api plied to a Naumkeag machine of the type shown in Patent No. 849,338,y which was granted April 2, 1907, upon the application,-

. of A. W. Rogers.

In the drawings, Fig. 1 is a view in section of one of the heads of such'a machine with my improved tool applied thereto;

Fig. 2 is an elevation of the tool with parts of the abrasive covering broken away and showing its application to the scouring of the scallop in the heel;

Fig. 3 is a longitudinal section of the tool; Fig. 4 is a transversevsection showing the a pllcation of the tool in scouring the breast of) the heel;

Fig. 5 is a perspective view of part of the clampin device for the upper end of the tool; an

Fig. 6 illustrates al1 auxiliary device for removing readily the clamping device.

In machines of the type above Amentioned a laterally extending head 1()V is provided with bearings 12 and'14 within which is supported for rotation a'hollow mandrel 16. A11' is supplied to the'mandrel through a passage 18, and a pulley 20 is provided intermediate between the bearings to rotate the mandrel. The lower end of the mandrel is threaded externally at 22 at a point removed from the end and internally at 24 near its extreme end. Suitable apertures 26 are providedin .the lateral walls, for a purpose to be later explained.

The illustrated bulli ng tool comprises a hollow cylindrical casing 30, which is closed at its lower end and has molded therein a screw 32 adapted to engage the internal threads 24 to retain the tool upon the mandrel. Owing to the air pressure present, it is necessary to unite the screw with the end of the cylindrical easing with more than ordinary care, and to this end, the'A head ofthe screw is provided with transverse openings 34 into which the liquid rubber may flow and with a series of anges 36 connected by parallel wires 38. When the liquid rubber hardens around this arrangement, the screw is very strongly held in the rubber casing regardless of the pressure of the air tending to push away .thel tool.

The bore of the casing is substantially the same as the external diameter of the mandrel, and its length is such as to extend substantially to the lower end of the threads 22. In order to retain the casing upon the mandrel and 4provide an air-tight joint at the upper end, I preferably prov/1de a nut 40, which constitutes an abutment for the upper end of the casing, and a clamping sleeve 42 cooperating with said abutment, said sleeve being split to form n ers 43 and tapered inwardly and weakene at 45, as shown in Fig. 3. Surrounding this tapered sleeve, a clamping cap 44 is provided, which may be screwed down along the mandrel by applying a Spanner wrench to the holes 47 and brought into engagement with the. outer surfaces of the tapered fingers on the sleeve 42, thereby forcing the cap 44 dqwnwardl to contract the fingers of the sleeve 42 and, securely elampithe upper end of the tool to 42 and co-operates with the end surface of the casing tor assist vin eecting an air-tight joint. Engagement of the inner should r of the sleeve 42 with the nut 40 limits the downward movement of the sleeve. A lock nut 46, provided with recesses 48 for engagementb a Spanner wrench, is arranged to be b'roug t tightly into engagement with the upper end of the cap thereby locking it in position.

When it is desired to remove the tool from the mandrel, lock nut 46 is irst loosened and then the cap 44 is'unscrewed and movedupwardly to release the sleeve 42. Sleeve 42 must then be forced upward. In order that this may be done easily and expeditiously, I have provided a special-tool 50 which is formed asa cylinder closed at the lower endand provided at the upper end with Ia rim 52 adapted to engage the lower edge of the cap 44 to lift itout of the way and .with a ledge 54 adapted to engage the lower'edge og the fingers of the sleeve 42. By this arrangement, the proper sequence of removal is ensured. After -the clamping devices have 1 been removed, it is only necessary to unscrew v the tool from the mandrel by manual engagement with the lower end..

lt will be understood`that tool itself is not intended to serve as an abrasive agent, and therefore, for the purpose of buling or scouring, a covering 60 of abrasive material is applied to the periphery of the tool. Preferably this covering is preformed by overlapping its sides at 62 and securing them tof' gether to form a closed cylinder with open ends having van internal diameter slightly larger than the outside diameter of the tool before air`pressure has been applied to it.

This relation is clearly shown in Fig. 3. Having applied the cover of abrasive material, it only remains to admitair under pressure to the inside of the tool through the lateral openings 26 in an amount suicient to enlarge the casing 30 frictionally to en age the abrasive covering and to lform a cu, on l of air between the mandrel and the rubber wall of the tool casing 30 as shown in Fig. 4. Having set the machine in motion to rotate the tool, the breast of a heel may be scoured by applying the heel in a horizontal osition as shown in Fig. 4 and moving it orward andbackward to bring the tool in contact with all parts of the breast of the heel. The

curvature of the tool is sufiiciently less than that of the breast of the heel to permit access to all parts thereof without danger of creating too marks. The operator may then tilt the shoe to a vertical position and apply the scallo to the tool in the manner -indicated in 1g. 2.

It will be noted that the pneumatic cushion .screw havi rovided throughout the greater part of the ength of the tool does not extend completely to the end of the tool because of the solid rubber portion at the outer end of the elastic cylinder 30. 'By reason of the fact that the n abrasive covering is slightly larger in diameter than the diameter of this solid end, however, a cushion effect will be provided A completely to the end of the tool by virtue of sive covering when the tool is distended, as

shown in Fig. 2.

Having described my invention, what l:

claim as new and desire to secure by Letters Patent of the UnitedStates is: v

1. A pneumatic buiing and scourin tool comprising a hollow mandrel provid with an air outlet opening near the tool receivinfv end, an elastic casing for said mandrel forme as an elongated .cylinder closed at one end and provided with means for attaching the same to the mandrel at the closed end of the cylinder, and means for clamping the open end of the cylinder to the mandrel at a point beyond the outlet opening. 4

2. A bufng tool comprising-an elongated cylinder of elastic material closed at one end and open at the other, and means for attaching said cylinder to a mandrel, said attachino means being ositionedinside the cylder 'at the close end thereof..

v3. ln a pneumatic buiing tool adapted to be mounted Aupon a rotating, hollow mandrel, means to secure an elastic casing on said mandrel comprising a clamping machanism .having ay spllt sleeve, a clamping ring'sur.

bringing said clamping ring forcibly into engagement with the s vlit sleeve.

.4. A pneumatic bu g tool comprisin a hollow cylinder of elastic material close at1 one end and open at the other, and means for securing said cylinder to a rotating mandrel com rising a screw projecting u wardly' within t e closed end of the cylin er, said a plurality of danges adapted to be molde into the material of the closed end of the cylinder whereby it is rigidly held in position and the screw may be rotated by engaging the c linder.

5. ln a mac e of the class described, a hollow mandrel having an air outlet opening and mounted for rotation in the head of the machine, means for supplying air to j the interior of said mandrel, a closure for the end of the mandrel com rising an elastic elongated cylinder provi ed with a closed end, means for securing theclosed end of the cylinder to the mandrel, means for clamp= ing the open end ofthe cylinder to the mandrel, and an abrasive sleeve constructed and arranged to be slipped over the elastic cylinder before the same is inflated and held in position solely by reason of its engagement with the distended walls of thecylinder after the same has been inflated.

6. In a machine of the class descriloedr, a

buiiing tool for the breast and scallop of ay and means for supplying air under pressure to the interior of the tool to provide at cushion for the abrasive covering and to expand the casing to bring it against the .abrasive covering so as to maintain-it in position on the too 7. In a machine of the class described, a

rotatably supported hollow mandrel meansl for supplying compressed air to'said mandrel, said mandrel having a projecting unsupported end provided with an air outletl opening, a cylindrical elastic casing having a closed end arranged to be positioned upon,

the unsupported end of the hollow mandrel, and means for clamping the upper end of said elastic casing to the mandrel above the air outlet opening so as to form an air-tight joint with the mandrel to allow theexpansion of the casing under'the pressure oit the air.

8. A pneumatic bulling tool comprising a hollow mandrel, an elastic casing covering part of said mandrel, and means for`clamping one end of said elastic casing to the mandrel comprising a sleeve whose end is split to provide a plurality of pointed lingers each of which is tapered from its outer end toward the point of its connection with the solid end of the sleeve to render the fingers` more flexible. f

9. A buliing tool comprising a hollow mandrel, an elastic casing surrounding said mandrel, an abutment on the mandrel adapted to' engage the end of the elastic casing, a clamping sleeve provided with a plurality ,ofspring fingers, and means for bringing said lingers forcibly into engage.- mentwith the outer surface of the elastic casing at a point adjacent to said abutment.

l0. A pneumatic builing tool comprising a supporting mandrel, an elastic casing on said mandrel provided with a closed and solid outer end, a cylindrical abrasive covering for the periphery of said tool slightly larger Ain internal diameter' than the diameter of thel closed end of the elastic casing and adapted to be held in position by expansion of the elastic casing above its closed end whereby said abrasivev covering.

will be supportedI by a cushion of air pressing part of the casmg against the covering above the solid end of theelastic casing and will bel slightly separated from the closed end of the tool surrounding vthe solid portion thereof, thereby leaving the outer end of saidfcovering unsupported to furnish a lexible abrading portion overlying the solid end of the casing bywirtue of .the inherent stiffness of the covermg'.-

ill. In a machine of the class described, a

pneumatic bulin tool comprising a hollow Amandrel rotatab y supported -at one end,

said mandrel having an air outlet opening adjacent to its unsupported end andan abutment above the air outlet openin a'cylindrical kelastic casing havingA a c osed vend adapted to be positioned over the' unsupported end of said hollowmandrel, a cylindrical abrasive covering surrounding said casing, and means cooperating with said I abutment to clamp the casing to the mandrel; so as to form an Vair-tight joint and permit the expansion of the casing b air under pressure supplied through t e mandrel thereby, to press the casing against thecylindrical abrasiveQcovering surrounding the casing to retain said covering upon the tool. In testimony whereof; have signed my name to this sppcilication, t 'E WARD F. HODGKINS. 

